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I want to output multiple passes using the File Output node in the compositor.

However, Blender's default output directory works together and outputs a combined pass.

When I type no directory in the input box, an image is created in the folder where Blender is installed.

I feel it like a waste of CPU because I want to get only another passes.

Is it necessary to output the combined pass in Blender?

Or is there any way to only output the passes I need in the compositor?

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    $\begingroup$ AFAIK you can't omit combined pass rendering. But if you use plain shaders and no lights in the scene this will hardly impact your render time. $\endgroup$ – kheetor Apr 12 '18 at 11:47
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    $\begingroup$ Possible duplicate of: blender.stackexchange.com/questions/102297/… $\endgroup$ – cegaton Apr 12 '18 at 14:23

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